body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    background-color: skyblue;
    overflow: hidden;
    transition: all 0.4s ease-out;
}

h2 {
    padding: 20px 0px;
    transition: all 0.3s;

    &.color {
        color: #ff0000;
    }

    &.size {
        font-size: 36px;
    }
}